Looks like he has since Tito put a beating on him. Saw him fight Cotto in Vegas back in 2011. He was always entertaining for about 4-6 rounds and then the class of his opponent almost always took over.
he looks and sounds ok to me to be honest. doesn't ahve the classic "marbles in the mouth." the lights look on and he looks like he's thinking clearly.
these guys take punsihsment to the head as a scoring criteria, man. none of the guys who make it to TV and fight for titles for years against punchers like mayorga did will be squeaky clean when they retire. he actually looks and sounds a lot better than shane, for example, who we all know was a disciplined fighter and didn't ahve the bad habits that mayorga had, like blocking punches with his forehead, chaining cigs, or getting trashed before fights.